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By Ping Xiao and Brian Ralph

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The phases based on a wurtzite-type structure have been characterised as polytypoids related to AlN [23]. The structures are Figure 6. The Si-Al-O-N behaviour diagram at 1800oC [22] 34 Advances in Ceramic Materials directly related to their compositions MmXm+1 and are described by the Ramsdell symbols 8H, 15R, 12H, 21R, 27R and 2H8, where H stands for hexagonal R rhombohedral and δ disordered. β -SiAlO . Pressureless sintering of β-SiAlON can be achieved to near theoretical density but this still requires the use of an additive such as MgO, Y2O3 or Nd2O3.

Log (viscosity (Pa. s)) 14 13 12 11 10 800 850 900 950 1000 1050 temperature (ºC) Eu Ce Sm Y Dy Ho Er Figure 10. Viscosities of different RE-Si-Al-O-N glasses with constant N content [53]. The effects on viscosity of changes in grain boundary glass chemistry, as a result of changes in sintering additives, can be summarised as follows: (1) When 18 e/o N is substituted for oxygen, viscosity increases by >2 orders of magnitude. (2) Increasing the Y:Al ratio of the glass results in a further slight increase in viscosity.

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